A retail installment sale is a transaction between you and a dealer to purchase a vehicle where, you agree to pay the dealer over time. Use a Business Bill of Sale to set out the terms for the sale of a business and transfer the ownership and all assets to the buyer.If you need copies of documents associated with the purchase of your vehicle, contact your Salesperson or the Sales Manager at your Ford Dealer. Yes, a purchase agreement is a valid and binding contract in NY IF the dodge dealership signed it. If they signed it, then they are held to its terms. Get a bill of sale in New York to be used for any vehicle, horse or general bill of sale record. Forms. Form of Underwriting Agreement from Ford filed with the Securities and Exchange Commission.